[{"arm_notes": "nan", "treatment_id": null, "treatment_name": "COVID-19 Standard Treatment;Exosome-MSC Intravenous injection", "treatment_type": "Drug;Drug", "pharmacological_treatment": "Pharmacological treatment"}, {"arm_notes": "nan", "treatment_id": null, "treatment_name": "COVID-19 Standard Treatment;Placebo Intravenous Injection", "treatment_type": "Drug;Drug", "pharmacological_treatment": "Pharmacological treatment"}]

[{"arm_notes": "", "treatment_id": 1502, "treatment_name": "Exosomes+mesenchymal stem cells", "treatment_type": "Advanced therapy medicinal products (atmp)", "pharmacological_treatment": "Biological treatment"}, {"arm_notes": "", "treatment_id": 2187, "treatment_name": "Placebo", "treatment_type": "Placebo", "pharmacological_treatment": "Placebo"}]